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Question:

The correct order of unpaired electrons present in d orbitals for elements Fe, Ti, Cr and Co is:

Fe>Co>Cr>Ti

Cr=Fe>Co>Ti

Cr>Fe>Co>Ti

Cr=Fe>Ti>Co

Solution:

Cr=[Ar] 4s1 3d5; 6 unpaired electrons
Fe=[Ar] 4s2 3d6; 4 unpaired electrons
Co=[Ar] 4s2 3d7; 3 unpaired electrons
Ti=[Ar] 4s2 3d2; 2 unpaired electrons
Cr>Fe>Co>Ti
Hence, option C is correct.